Electric power in watts (W) to electric current in amps (A) calculator.

* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12

Watt (W) is a unit of power. Power is the rate of energy usage per time unit. One watt (W) is equal to one joule (J) per second (S).

Ampere (A) is a unit of electric current. Electric current is the rate of electric charge flow per time unit. One ampere (A) is equal to one coulomb (Q) per second (s).

The current *I* in amps (A) is equal to the power *P* in watts (W), divided by
the voltage *V* in volts (V):

*P* = 200W, *V* = 40V

200W40V

= 5AThe phase current *I* in amps (A) is equal to the power *P* in
watts (W), divided by the
power factor *PF* times the RMS voltage *V* in volts (V):

The power factor of resistive impedance load is equal to 1.

*P* = 2000W, *V* = 110V, *PF* = 0.8

2000W0.8×110V

= 22.72727AThe phase current *I* in amps (A) is equal to the power *P* in
watts (W), divided by square root of 3 times the
power factor *PF* times the line to line RMS voltage *V*_{L-L} in volts (V):

The power factor of resistive impedance load is equal to 1.

The phase current *I* in amps (A) is equal to the power *P* in
watts (W), divided by 3 times the
power factor *PF* times the line to neutral RMS voltage *V*_{L-N} in volts (V):

The power factor of resistive impedance load is equal to 1.

Do not use typical power factor values for accurate calculations.

Device | Typical power factor |
---|---|

Resistive load | 1 |

Fluorescent lamp | 0.95 |

Incandescent lamp | 1 |

Induction motor full load | 0.85 |

Induction motor no load | 0.35 |

Resistive oven | 1 |

Synchronous motor | 0.9 |

Power (W) | Voltage (V) | Current (A) |
---|---|---|

10 watts | 120 volts | 0.0833 amps |

20 watts | 120 volts | 0.167 amps |

30 watts | 120 volts | 0.250 amps |

40 watts | 120 volts | 0.333 amps |

50 watts | 120 volts | 0.417 amps |

60 watts | 120 volts | 0.500 amps |

70 watts | 120 volts | 0.583 amps |

80 watts | 120 volts | 0.667 amps |

90 watts | 120 volts | 0.750 amps |

100 watts | 120 volts | 0.833 amps |

200 watts | 120 volts | 1.667 amps |

300 watts | 120 volts | 2.500 amps |

400 watts | 120 volts | 3.333 amps |

500 watts | 120 volts | 4.167 amps |

600 watts | 120 volts | 5.000 amps |

700 watts | 120 volts | 5.833 amps |

800 watts | 120 volts | 6.666 amps |

900 watts | 120 volts | 7.500 amps |

1000 watts | 120 volts | 8.333 amps |

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